Fixing a Runny Glaze

I have been testing this glaze, and I like the surface-kind of a bright Celadon without the colourants. I want to prevent it from running as it does now. I know that I need to up the clay content, but by what percentage? How much kaolin can I add without changing the character/shininess of the glaze?
Here's the recipe
Cone 10 reduction
Synthetic Ash.
Potash feldspar 33
Whiting 33
Albany slip 13
Kaolin[EPK[ 5
Bentonite 5
Bone Ash 3.5
Dolomite 2.5
Silica[flint] 1.5
------
96.5
Red Iron ox. 3
Cobalt carb. 1.5
Total 100

I would add double EPK in a small test as I tend to make large jumps to see whats happinging quickly.You can make the test in stages as you add more then dip a tile then addd more EPK and dip agin and so on.
If its to much cut that to 1/2 of double.
There will be a point that it gets dry as EPK has so much silica and alumina.
Good luck testing
Mixing a few tests today for this weeks glaze fire as well.

I would add double EPK in a small test as I tend to make large jumps to see whats happinging quickly.You can make the test in stages as you add more then dip a tile then addd more EPK and dip agin and so on.If its to much cut that to 1/2 of double.There will be a point that it gets dry as EPK has so much silica and alumina.Good luck testingMixing a few tests today for this weeks glaze fire as well.

Mark;I am thinking like 5%, then another 5%, then another 5% in the same cup. Thanks for your rapid response. Sounds like you are back at it ,and the holiday is over.Tom.

I would add double EPK in a small test as I tend to make large jumps to see whats happinging quickly.You can make the test in stages as you add more then dip a tile then addd more EPK and dip agin and so on.If its to much cut that to 1/2 of double.There will be a point that it gets dry as EPK has so much silica and alumina.Good luck testingMixing a few tests today for this weeks glaze fire as well.

Mark;I am thinking like 5%, then another 5%, then another 5% in the same cup. Thanks for your rapid response. Sounds like you are back at it ,and the holiday is over.Tom.

Holiday is over thats for sure-fire two kilns this weekendMixed glazes today-will glaze a load on MondayJust did Arizona show and next show is in two weeks at UC Davis in middle of California near Sacramentogalleries need pots now and the list goes on-Holiday seems like a distant memory At least we have some Great spring weather.I like the 5 then 5% deal as you will see right away whats going on.MarkMark

Just adding EPK can stiffen it up, but can also alter the surface because it changes the silica/alumina ratio. To keep the ration consistent while stiffening it up, add equal parts EPK and flint (silica). Start with 2% each, and go up in 2% increments.